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0003-KVM-Implement-kvm_put_guest.patch
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0003-KVM-Implement-kvm_put_guest.patch
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From 475c4bc62aba36b87e1ada0a2eab777d3ecc47d1 Mon Sep 17 00:00:00 2001
From: AltArch Kernel <noreply@centos.org>
Date: Wed, 23 Sep 2020 16:01:29 +0800
Subject: [PATCH 03/25] KVM: Implement kvm_put_guest()
mainline inclusion
from mainline-v5.8-rc5
commit cac0f1b7285eaaf9a186c618c3a7304d82ed5493
category: feature
bugzilla: NA
DTS: #231
CVE: NA
--------------------------------
kvm_put_guest() is analogous to put_user() - it writes a single value to
the guest physical address. The implementation is built upon put_user()
and so it has the same single copy atomic properties.
---
include/linux/kvm_host.h | 23 +++++++++++++++++++++++
1 file changed, 23 insertions(+)
diff --git a/include/linux/kvm_host.h b/include/linux/kvm_host.h
index 6882538..9e6ad99 100644
--- a/include/linux/kvm_host.h
+++ b/include/linux/kvm_host.h
@@ -27,6 +27,7 @@
#include <linux/irqbypass.h>
#include <linux/swait.h>
#include <linux/refcount.h>
+#include <linux/uaccess.h>
#include <asm/signal.h>
#include <linux/kvm.h>
@@ -688,6 +689,28 @@ int kvm_write_guest_offset_cached(struct kvm *kvm, struct gfn_to_hva_cache *ghc,
void *data, int offset, unsigned long len);
int kvm_gfn_to_hva_cache_init(struct kvm *kvm, struct gfn_to_hva_cache *ghc,
gpa_t gpa, unsigned long len);
+
+#define __kvm_put_guest(kvm, gfn, offset, value, type) \
+({ \
+ unsigned long __addr = gfn_to_hva(kvm, gfn); \
+ type __user *__uaddr = (type __user *)(__addr + offset); \
+ int __ret = -EFAULT; \
+ \
+ if (!kvm_is_error_hva(__addr)) \
+ __ret = put_user(value, __uaddr); \
+ if (!__ret) \
+ mark_page_dirty(kvm, gfn); \
+ __ret; \
+})
+
+#define kvm_put_guest(kvm, gpa, value, type) \
+({ \
+ gpa_t __gpa = gpa; \
+ struct kvm *__kvm = kvm; \
+ __kvm_put_guest(__kvm, __gpa >> PAGE_SHIFT, \
+ offset_in_page(__gpa), (value), type); \
+})
+
int kvm_clear_guest_page(struct kvm *kvm, gfn_t gfn, int offset, int len);
int kvm_clear_guest(struct kvm *kvm, gpa_t gpa, unsigned long len);
struct kvm_memory_slot *gfn_to_memslot(struct kvm *kvm, gfn_t gfn);
--
1.8.3.1